I didn't adjust well to it because I have an erratic sleep schedule, probably partially from a decade of shift work. I am also not a morning person at all and adjusting to 9-5 (or 8-5 or 8-6:30 which is more common around here) was brutal.
Is the job actually 9-5 for real? Like an 8 hour shift that includes lunch? If so, that's a pretty sweet gig. Like NOWHERE let's your lunch be part of your day anymore.
Overall I'm happier at a more consistent job time now. Easier to plan around, no more close-to-open bs.